在EF圆圈参考中包含方法

Question

我有两个班级：

public partial class User
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public User()
    {
        this.ActionLogs = new HashSet<ActionLog>();
        this.Exceptions = new HashSet<Exception>();
        this.OnlineUsers = new HashSet<OnlineUser>();
        this.UserRoles = new HashSet<UserRole>();
    }

    public long Id { get; set; }
    public string UserName { get; set; }
    public string Password { get; set; }
    public byte[] HashPass { get; set; }
    public string LoweredUserName { get; set; }
    public Nullable<long> BussinessPartnerId { get; set; }
    public Nullable<long> BranchId { get; set; }
    public Nullable<bool> IsSelected { get; set; }
    public Nullable<long> CreatedBy { get; set; }
    public Nullable<System.DateTime> CreationDate { get; set; }
    public Nullable<System.DateTime> LastUpdateTime { get; set; }
    public Nullable<long> LastUpdatedBy { get; set; }
    public Nullable<bool> IsActive { get; set; }

    public virtual ICollection<ActionLog> ActionLogs { get; set; }
    public virtual BussinessPartner BussinessPartner { get; set; }
    public virtual ICollection<Exception> Exceptions { get; set; }
    public virtual ICollection<OnlineUser> OnlineUsers { get; set; }
    public virtual ICollection<UserRole> UserRoles { get; set; }
}

和

public partial class BussinessPartner
{
    public BussinessPartner()
    {
        this.PositonAppointments = new HashSet<PositonAppointment>();
        this.Users = new HashSet<User>();
    }

    public long Id { get; set; }
    public Nullable<long> PersonId { get; set; }
    public Nullable<long> OrganizationId { get; set; }
    public Nullable<long> EmployeeId { get; set; }
    public Nullable<int> Type { get; set; }
    public string FullName { get; set; }
    public string Code { get; set; }
    public Nullable<long> BranchId { get; set; }
    public Nullable<bool> IsSelected { get; set; }
    public Nullable<long> CreatedBy { get; set; }
    public Nullable<System.DateTime> CreationDate { get; set; }
    public Nullable<System.DateTime> LastUpdateTime { get; set; }
    public Nullable<long> LastUpdatedBy { get; set; }
    public Nullable<bool> IsActive { get; set; }

    public virtual Employee Employee { get; set; }
    public virtual Organization Organization { get; set; }
    public virtual Person Person { get; set; }
    public virtual ICollection<PositonAppointment> PositonAppointments { get; set; }

    public virtual ICollection<User> Users { get; set; }
}

我为我的服务编写了这段代码：

[OperationContract]
public User DoWork()
{
    var db = new AbanEntities();
    db.Configuration.ProxyCreationEnabled = false;

    var u = db.Users.Include("BussinessPartner").First();
    return u;
}

问：在result =＆gt;中你是用户，并且拥有一个名为BussinessPartner的属性，BussinessPartner字段具有值，BussinessPartner有一个名为＆＃39; User＆＃39;的属性，而且这个字段有价值，但我想要＆＃39;用户＆＃39;为空